Practice test PSI
1. The service disconnecting means may be installed in all of the following
EXCEPT <Ans> the bathroom.
2. What is the minimum size EMT conduit required for three 14 AWG, six 12
AWG, and three 8 AWG conductors? All wires are THHN solid wire. <Ans>
1 inch
3. Overcurrent protection for feeders branch circuits supplying electric vehicle
supply equipment shall be sized for continuous duty and shall have a rating
of not less than what percentage of the maximum load of the electric vehicle
supply equipment? <Ans> 125%
4. A continuous load is a load where the maximum current is expected to
continue for at least how long? <Ans> 3 hours
5. The ampacity of the conductors from the generator terminals to the first
distribution device(s) containing overcurrent protection shall not be less than
what percentage of the nameplate current rating? <Ans> 115%
6. ENT shall not be <Ans> threaded.
7. A panelboard for a mobile home shall be rated not less than which of the
following? <Ans> 50 amperes
8. Disregarding exceptions, liquidtight flexible metal conduit shall be support-
ed and secured at intervals not to exceed <Ans> 4 1/2 feet.
9. What is the maximum weight of a luminaire that can be supported by the
screw shell of a lampholder? <Ans> 6 pounds
10. Disregarding exceptions, what is the minimum size copper-clad aluminum
underground service conductor permitted? <Ans> 6 AwG
,11. The base of a 24-foot non-self-supporting ladder shall be placed approxi-
mately how far from the vertical structure upon which is leaning? <Ans> 6
feet
12. Alternating-current systems of less than 50 volts shall be grounded where
supplied by transformers, if the transformer supply system exceeds which of
the following? <Ans> 150 volts to ground
13. What is the maximum distance that the emergency controls for an at-
tended self-service motor fuel dispensing facility shall be located from the
dispensers? <Ans> 100 feet
14. Where the negative polarity of a dc system does not serve as the con-
nection point for the grounded conductor, which color finish can be used to
identify the negative ungrounded conductor? <Ans> black
15. One horsepower is equal to how many watts? <Ans> 746
16. The conductors, including splices and taps, shall not fill the wireway to
more than what percentage of its area? <Ans> 75%
17. outlet for a 12 AWG conductor with a listed outlet branch-circuit type
arc-fault circuit interrupter installed at the first outlet What is the maximum
, permitted length of the branch-circuit wiring from the branch-circuit overcur-
rent device to the first box? <Ans> 70 feet
18. Which type of surge protection device is permanently connected and
intended for installation between the secondary of the service transformer
and the line side of the service disconnect overcurrent device? <Ans>
Type 1
19. What is the power of a 4-ohm resistive load connected to a 120-volt power
supply? <Ans> 120v/4ohm=3OA 30X120V= 3600w
20. Approximately how many kilowatts are used by a three-phase, 480- voit ac
motor that draws a current of 52 amperes and has a power factor rating of 88
% <Ans> 480v x 52a x 1.735= 43180W x .88= 38000w
21. What is the greatest root-mean-square (effective) difference of potential
between any two conductors of a circuit defined as? <Ans> voltage
22. A resistor has the following colored bands (in order) <Ans> orange, red,
brown, silver. What is the resistor value? <Ans> 320 Ohms (10% tolerance)
23. What is the formula for calculating power (watts)? <Ans> R x I 2
24. For other than a totally enclosed switchboard or switchgear, what is the
minimum amount of space that shall be provided between the top of the
unshielded switchboard or switchgear and any combustible ceiling?
<Ans> 36"
25. What is the required width of the working space in front of electrical
equipment with a 22-inch width? <Ans> 30 inches
26. What is the minimum fire rating for electrical vaults housing electrical
equipment over 600 volts, nominal? <Ans> 3 hours
27. What is the maximum voltage drop for any branch circuit, separately
1. The service disconnecting means may be installed in all of the following
EXCEPT <Ans> the bathroom.
2. What is the minimum size EMT conduit required for three 14 AWG, six 12
AWG, and three 8 AWG conductors? All wires are THHN solid wire. <Ans>
1 inch
3. Overcurrent protection for feeders branch circuits supplying electric vehicle
supply equipment shall be sized for continuous duty and shall have a rating
of not less than what percentage of the maximum load of the electric vehicle
supply equipment? <Ans> 125%
4. A continuous load is a load where the maximum current is expected to
continue for at least how long? <Ans> 3 hours
5. The ampacity of the conductors from the generator terminals to the first
distribution device(s) containing overcurrent protection shall not be less than
what percentage of the nameplate current rating? <Ans> 115%
6. ENT shall not be <Ans> threaded.
7. A panelboard for a mobile home shall be rated not less than which of the
following? <Ans> 50 amperes
8. Disregarding exceptions, liquidtight flexible metal conduit shall be support-
ed and secured at intervals not to exceed <Ans> 4 1/2 feet.
9. What is the maximum weight of a luminaire that can be supported by the
screw shell of a lampholder? <Ans> 6 pounds
10. Disregarding exceptions, what is the minimum size copper-clad aluminum
underground service conductor permitted? <Ans> 6 AwG
,11. The base of a 24-foot non-self-supporting ladder shall be placed approxi-
mately how far from the vertical structure upon which is leaning? <Ans> 6
feet
12. Alternating-current systems of less than 50 volts shall be grounded where
supplied by transformers, if the transformer supply system exceeds which of
the following? <Ans> 150 volts to ground
13. What is the maximum distance that the emergency controls for an at-
tended self-service motor fuel dispensing facility shall be located from the
dispensers? <Ans> 100 feet
14. Where the negative polarity of a dc system does not serve as the con-
nection point for the grounded conductor, which color finish can be used to
identify the negative ungrounded conductor? <Ans> black
15. One horsepower is equal to how many watts? <Ans> 746
16. The conductors, including splices and taps, shall not fill the wireway to
more than what percentage of its area? <Ans> 75%
17. outlet for a 12 AWG conductor with a listed outlet branch-circuit type
arc-fault circuit interrupter installed at the first outlet What is the maximum
, permitted length of the branch-circuit wiring from the branch-circuit overcur-
rent device to the first box? <Ans> 70 feet
18. Which type of surge protection device is permanently connected and
intended for installation between the secondary of the service transformer
and the line side of the service disconnect overcurrent device? <Ans>
Type 1
19. What is the power of a 4-ohm resistive load connected to a 120-volt power
supply? <Ans> 120v/4ohm=3OA 30X120V= 3600w
20. Approximately how many kilowatts are used by a three-phase, 480- voit ac
motor that draws a current of 52 amperes and has a power factor rating of 88
% <Ans> 480v x 52a x 1.735= 43180W x .88= 38000w
21. What is the greatest root-mean-square (effective) difference of potential
between any two conductors of a circuit defined as? <Ans> voltage
22. A resistor has the following colored bands (in order) <Ans> orange, red,
brown, silver. What is the resistor value? <Ans> 320 Ohms (10% tolerance)
23. What is the formula for calculating power (watts)? <Ans> R x I 2
24. For other than a totally enclosed switchboard or switchgear, what is the
minimum amount of space that shall be provided between the top of the
unshielded switchboard or switchgear and any combustible ceiling?
<Ans> 36"
25. What is the required width of the working space in front of electrical
equipment with a 22-inch width? <Ans> 30 inches
26. What is the minimum fire rating for electrical vaults housing electrical
equipment over 600 volts, nominal? <Ans> 3 hours
27. What is the maximum voltage drop for any branch circuit, separately
